Transform a vector at values passing a particular condition

[lokeshh]

#where is used to list those values of vector that pass a particular condition. May be it would be equally good to have something in Daru that lets you do transformation to a vector for values that pass a particular condition.

It would work as follow:

> def convert_to_days week
>   "#{week.split.first.to_i * 7} days"
> end
> dv = Daru::Vector.new ['3 days', '5 weeks', '2 weeks']
> dv2 = dv.apply_where(dv.match /weeks/) do |val|
>   convert_to_week val
> end
> dv2
#<Daru::Vector:17000420 @name = nil @metadata = {} @size = 3 >
            nil
      0  3 days
      1 35 days
      2 14 days

dv.match comes from this feature request.

[v0dro]

Nifty.